1. 05 3月, 2018 19 次提交
  2. 03 3月, 2018 2 次提交
    • D
      libnvdimm: re-enable deep flush for pmem devices via fsync() · 5fdf8e5b
      Dave Jiang 提交于
      Re-enable deep flush so that users always have a way to be sure that a
      write makes it all the way out to media. Writes from the PMEM driver
      always arrive at the NVDIMM since movnt is used to bypass the cache, and
      the driver relies on the ADR (Asynchronous DRAM Refresh) mechanism to
      flush write buffers on power failure. The Deep Flush mechanism is there
      to explicitly write buffers to protect against (rare) ADR failure.  This
      change prevents a regression in deep flush behavior so that applications
      can continue to depend on fsync() as a mechanism to trigger deep flush
      in the filesystem-DAX case.
      
      Fixes: 06e8ccda ("acpi: nfit: Add support for detect platform CPU cache...")
      Reviewed-by: NJeff Moyer <jmoyer@redhat.com>
      Signed-off-by: NDave Jiang <dave.jiang@intel.com>
      Signed-off-by: NDan Williams <dan.j.williams@intel.com>
      5fdf8e5b
    • D
      vfio: disable filesystem-dax page pinning · 94db151d
      Dan Williams 提交于
      Filesystem-DAX is incompatible with 'longterm' page pinning. Without
      page cache indirection a DAX mapping maps filesystem blocks directly.
      This means that the filesystem must not modify a file's block map while
      any page in a mapping is pinned. In order to prevent the situation of
      userspace holding of filesystem operations indefinitely, disallow
      'longterm' Filesystem-DAX mappings.
      
      RDMA has the same conflict and the plan there is to add a 'with lease'
      mechanism to allow the kernel to notify userspace that the mapping is
      being torn down for block-map maintenance. Perhaps something similar can
      be put in place for vfio.
      
      Note that xfs and ext4 still report:
      
         "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"
      
      ...at mount time, and resolving the dax-dma-vs-truncate problem is one
      of the last hurdles to remove that designation.
      Acked-by: NAlex Williamson <alex.williamson@redhat.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: kvm@vger.kernel.org
      Cc: <stable@vger.kernel.org>
      Reported-by: NHaozhong Zhang <haozhong.zhang@intel.com>
      Tested-by: NHaozhong Zhang <haozhong.zhang@intel.com>
      Fixes: d475c634 ("dax,ext2: replace XIP read and write with DAX I/O")
      Reviewed-by: NChristoph Hellwig <hch@lst.de>
      Signed-off-by: NDan Williams <dan.j.williams@intel.com>
      94db151d
  3. 02 3月, 2018 2 次提交
  4. 01 3月, 2018 17 次提交